Cosmological horizon crossing
= Cosmological horizon crossing
A mode of comoving wavenumber $k$ and physical wavelength $2\pi a/k$ crosses a conformal horizon of physical size $ac\tau$ when
$$
\tau_H=\frac{2\pi}{kc}.
$$
= Cosmological horizon crossing
A mode of comoving wavenumber $k$ and physical wavelength $2\pi a/k$ crosses a conformal horizon of physical size $ac\tau$ when
$$
\tau_H=\frac{2\pi}{kc}.
$$